Lens and manufacturing method thereof
US10634866B2 · kind B2 · utility
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1References
20Claims
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Key dates
| Filing date | Jul 19, 2018 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Dec 27, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens including a lens barrel and five lens elements is provided. A relation between the amount of field curvature variation Sa1 of a system caused by a thickness tolerance of a lens element in the lens and an amount of field curvature variation Sa2 of the system caused by a change of a gap between the lens element and an adjacent lens element thereof is described as follows. Sa2 is twice or less of Sa1. Sa2 and Sa1 are both positive values or both negative values to render a better field curvature performance of the lens. A manufacturing method of the lens is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.